Film rewind device for compact cinecameras

ABSTRACT

A film rewind device for compact cinecameras of the type using a film cartridge having no supply spool shaft operable from the exterior thereof but provided with detent means attached to a take-up core, and in which the length of film to be loosely supplied to the take-up chamber of the cartridge can be varied in proportion to the film roll diameter in the supply chamber of the cartridge by the utmost utilization of the fact that the space in each of the supply and take-up chambers varies in proportion to the length of film photographed, and the length of film to be loosely supplied into the take-up chamber can be selected as desired within a predetermined range and that length of film can be rewound exactly.

United States Patent Yozo [ Sept. 5, 1972 [72] lnventorz lida You,Tokyo, Japan [73] Assignee: Nippon Kogaku K.K., Tokyo,

Japan [22] Filed: Nov. 23, 1970 21 Appl. No.: 91,997

[30] Foreign Application Priority Data Nov. 28, 1969 Japan. ....44 /95167 [52] US. Cl. ..352/9l, 352/172, 352/217 [51] Int. Cl ..".....G03b21/36 [58] Field of Search", ..352/91, 217, 156, 172 [56] ReferencesCited 2 2 UNITED STATES PATENTS 3,582,198 6/1971 Reinsch ..352/913,549,249 12/1970 Katsuyama ..352/91 3,545,852 12/1970 Winkleretal..352/91 Primary ExaminerSamuel S. Matthews Assistant Examiner-RussellB. Adams, Jr. Attorney-Ward, McElhannon, Brooks & Fitzpatrick .7 P571,.r ABS R C A film rewind device for compact cinecameras of the typeusing a film cartridge having no supply spool shaft operable from theexterior thereof but provided with detent means attached to a take-upcore, and in which the length of film to be loosely supplied to thetake-up chamber of the cartridge can be varied in proportion to the filmroll diameter in the supply chamber of the cartridge by the utmostutilization of the fact that the space in each of the supply and take-upchambers varies in proportion to the length of film photographed, andthe length of film to be loosely supplied into the take-up chamber canbe selected as desired within a predetermined range and that length offilm can be rewound exactly.

6 Claims, 9 Drawing Figures PATENTEDSEP 5 I972 SHEEI 3 OF 3 FILM LENGTH\M O A mwmszio 2 5 6 mum FILM REWIND DEVICE FOR COMPACT CINECAMERASBACKGROUND OF THE INVENTION 1. Field of the Invention This inventionrelates to compact cinecameras, and more particularly to a film rewinddevice for such cameras.

2. Description of the Prior Art Some of the film cartridges used withcinecameras are provided with detent means disposed in the take-upchamber thereof for preventing slackening of the fed film in thecartridge. In a cinecamera using a film cartridge of such type, thedouble-exposure technique is adapted and in this connection the filmrewind opera tion is effected by temporally stopping "the take-up of thefilm so as to store a predetermined length of the fed film in the spacewithin the cartridge and thereafter rewinding that length of film. Sucha system can not always ensure an available or sufficient space withinthe cartridgefor that purpose. More specifically, during the initialstage of photographing, space is abundant in the take-up chamber intowhich the film is supplied loosely with the take-up core beingtemporally stopped, whereas space is approximately null in the supplychamber into which the loosely supplied film is to be rewound. Duringthe intermediate stage of photogra' phing, the spaces in the supply andtake-up chambers become substantially equal to each other and the lengthof film to be supplied or the length of film to be rewound becomesgreatest at this stage. At the final stage of photographing, the take-upchamber is full of film and no space is available therein.

Attempts have heretofore been made to solve this problem by presettingan unrewindable range for several feet of the film in each of theleading and trail ing end portions thereof and a rewindable range forthe intermediate portion of the film. As a result, the length of film tobe rewound has been limited to a predetermined value. An attempt toincrease such limited length of film to be rewound has entailed adecrease in the rewindable range, and an attempt to increase therewindable range has entailed adecrease in the length of film toberewound.

SUMMARY OF THE INVENTION It is the object of the present invention toovercome the above-described disadvantages existing in the prior art andprovide a film rewind device for cinecameras in which the length of filmto be loosely supplied to the take-up chamber of a film cartridge can bevaried in proportion to the film roll diameter in the supply chamber ofthe cartridge by the utmost utilization of the fact that the space ineach of the supply and take-up chambers varies in proportion to thelength of film vided no shaft for a film supply spool, the cinecameraincluding shutter shaft associated at least with drive means for drivingshutter means, film supply means and film measuring means. An automaticstop means for automatically stopping normal and reverse rotations ofthe shutter shaft and provided on the shutter shaft or on anintermediate shaft associated therewith, the improvement comprises: adisplace means associated with the film measuring means to be displacedin such manner that the amount of displacement is zero at theextremities of an indicator scale on the measuring means and that theamount of displacement is greatest .in the middle of the indicatorscale; first control means associated with the displace means anddisplaceable in response to the displacement of the displace meansduring normal photographing operation for determining the time for theautomatic stop means to automatically stop the normal rotation of theshutter shaft to thereby control the amount of the film to bephotographed with the film being loosely fed; and second control meansdisplaceable within the amount of displacement of the first controlmeans when the device has been changed over from the normalphotographing position to another photographing position for takingcontinuous shot with the film being loosely fed, the displacement of thesecond control means determining the time for the automatic stop meansto stop the reverse rotation of the shutter shaft to thereby control theamount of film to be rewound.

The above and other features of the present invention will become fullyapparent from the following detailed description taken in conjunctionwith the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view schematicallyshowing the essential parts of the film rewind device embodying thepresent invention as the device has been set in a position for startingnormal photographing.

FIG. 2. is a plan view similar to FIG. 1 but showing the device as it isin a position where photographing is progressed to a certain degree.

FIG. 3 is a plan view again similar to FIG. 1 but showing the device asit is changed over form the position of FIG. 2 to a position foreffecting continuous shot while loosely supplying a film into thetake-up chamber by temporally stopping the film take-up operation.

FIG. 4 is a plan view also similar to FIG. 1 but showing the device asit is rewound from the position of FIG. 3.

FIG. 5 is a cross-sectional view taken along lines V- V of FIG. 1.

FIG. 6 is a partly sectional view taken along line VI of FIG. 5.

FIG. 7 is a partly sectional view taken along line VII of FIG. 1.

FIG. 8 is a graphical representation for illustrating the relationshipbetween the film roll diameter and the space in each of supply andtake-up chambers in a film cartridge used with the present invention.

FIG. 9 is a perspective view for illustrating the relationship betweenthe film cartridge and the film feeding means.

Referring to FIG. 1, a shutter shaft 1 operatively associated with aconventional shutter means (not shown) and with a film feeding pawl 53(FIG. 9) movable in opposite directions is securely provided. with a pin1', a worm 2, a pair of pawled stop discs 3 and 4, a shutter gear 5 anda shutter 6, these being positioned at suitable distances as hereinafterexplained. A micromotor 7 has an output shaft connected to the shuttershaft 1 at one end thereof via pinion 8 and shutter gear 5. Themicromotor 7 is a reversible motor energized through a change-overswitch 50 for changing the rotational direction of the motor to bedescribed and thereby the shutter shaft 1 is driven to rotate in normalor reverse direction. A film take-up gear9 is engaged with a take-upshaft 56 (FIG. 9) (The manner of this engagement is not shown) which isenclosed in a conventionalfilm cartridge having no rewind spool shaftbut provided with detent means for preventing the film slack. The filmtake-up gear 9 is mounted on ashaft l0 journalled to the body of acamera and is engageable with a clutch gear 11 formed of a thin spurgear and serving also as a worm wheel, so that the gear 9 is driven torotate by the clutch gear 1 1. As shown in FIG. 5, the clutch gear 11 isrotatably mounted on a shaft 12 together with an integral gear 13 insuch a manner that an inverted L-shaped clutch lever 14 is sandwiched atthe upper end thereof between the clutch gear 11 and the integral gear13. The clutch gear 11 is in engagement with the worm 2 seated on theshutter shaft 1. The

clutch lever 14 is pivotally mounted on a pin 15 secured to the camerabody and is biased by a compression spring 16 so that a projection 14aformed in one arm of the clutch leverl4 is urged into contact with aclutch cam 18. The clutch cam 18 is mounted rotatably on a shaft 20which is manually operated by a knob '17 formed integrally therewith.The operating knob 17 has integrally switch cam 19 which will bedescribed later in detail. The operating knob 17 is provided withmarking 21- including letters B, F and N formed at predeterminedpositions therein, which marking cooperates with an index 22 formed inthe camera body. The clutch cam 18 is designed to selectively displacethe clutch lever 14 so that the take-up gear 9 is engaged with theclutch gear 11 when the letter N of the marking 21 is registered withthe index 22 and that the gear 13 (FIG. 5) is engaged with counter gears23 and 25 to be described when the letter F or B of the marking 21 isregistered with the index 22.

In FIG. 5, the counter gears 23 and 25 are rotatably mounted on a commonshaft 27 which is rotatably journalled to the camera body and integralwith a detector gear 28 having a projection 29 for engaging a rack 31 tovary the amount of film to be rewound. The counter gear 23 has a pin 24studded therein and extending through an elongated actuate slot 25aformed in the counter gear 25, as shown in FIG. 6. The pin 24 is adaptedto actuate astop pawl 37, which will be described later, when the knob17 is rotated until the mark B thereon is registered with the index 22as shown in FIG. 4. The counter gear 25 is further formed with a pin 26radially opposite side to the slot 25a. The pin 26 is urged into contactwith the projection 29 formed axially on a detector gear 28 to bedescribed when the counter gear 25 is disengaged from the gear 13integral with the clutch gear 11.

'The counter gear 25 and its pin 26 together constitute first controlmeans, and the counter gear 23 and itspin 24 together constitute secondcontrol means.

The rack 31 always engaged with the detector gear 28 receives guide pins32 in the guide slots formed therein and is biased by a tension spring33 into engagement with a cam 35 which is rotated by the shutter shaft 1through an unshown interlocking member connecting operative to a shaft36 of a film measuring disc 34. Thecam35'is so arranged that the cammovement- A stop member 37 having a projection 37a vertically I formedthereon and a longitudinally projected top end 37b is pivotally mountedon the camera body by means of a pin 39. A U-shaped spring 38 is securedto the shaft 39 and a pin 40 studded in the camera body in such a mannerthat the upper ends of the U-shapcd spring 38 resiliently holdstherebetween the projection 37a of the stop member 37. Thus, the stopmember 37 is resiliently held by the U-shaped spring 38 so that theprojected top end 37b is disposed between the pawl stops of the discs 3and 4. The stop member 37 further includes a lower lateral projection37c corresponding to the pins 24 and 26 studded in the counter gears 23spaced with respect to the projected top end 37b of the stop member 37so as not to interfere therewith. The shoulders 41 and 42 are set insuch an angular relation that the position in which they are broughtinto abutment with the projected top end 37b of the stop member 37 whenthey are stopped out of a possible take-up or rewind range orautomatically stopped in accordance with a length of film photographedduring a first shot, as described later, is the same as the position inwhich they are stopped by. an unshown pawl for stopping the shuttershaft.

The switch cam 19 integral with the operating knob 17 has a recess 19afor receiving the left end projection 47a of a switch lever 47 when themark B of the knob 17 is registered with the index 22. The switch lever47 is pivotally mounted on a shaft 48 secured to the camera body and isbiased by a tension spring 49 so that the projection 47a thereof isnormally urged into contact with the switch cam 19, and that when theleft end 47a is received in the recess 19a the right end 47b actuates achange-over switch 50 into a position for establishing a reverse drivecircuit.

A power supply battery 51 and a switch 52 associated with the micromotor7 and unshown shutter button constitute a change-over circuit fordriving the shutter shaft 1 to rotate in normal and reverse directions.

As shown in FIG. 9, film supply pawl means 53 is provided slidably onthe shafts 54 and formed with a 'slot to receive the eccentric pin 1'integrally adapted to the disc 6 eccentrically with the center thereof,thus the film being moved in normal or reverse directions. Filmcartridge 55 of the known type encloses therein a takeulp core 56provided with means for preventing the film s ack.

In operation, the operating knob 17 is manually rotated until the mark Nthereof is registered with the index 22 as shown in FIGS. 1 or 2. Theshutter button (not shown) is operated to close the switch 52, whereby anormal drive circuit is established and the micromotor, 7 is therebyrotated in normal direction. Thus, the shutter shaft 1 is also driven torotate in normal direction by the micromotor 7 via pinion 8 and shuttergear 5, so that the feeding pawl 53 associated with the shutter shaft 1feeds the film in normal direction. At the same time, the take-up gear 9is driven through worm 2 and clutch gear 11 so that the film is taken upby the take-up shaft 56 adapted within the film cartridge. Thus, normalshot may be effected. Concurrently therewith, the film measuring disc 34is driven to rotate by the shutter shaft 1 via unshown interlockingmember to thereby indicate the length of film photographed, and the cam35 integral with the film measuring disc 34 is also rotated to displacethe rack 31, whose displacement is converted through the projection 29of the detector gear 28 into a possible take-up or rewind range asindicated by (FIG. 6) corresponding to the length of film photographed(FIG. 2). Subsequently the operating knob 17 is further rotated withoutinterrupting the described shutter operation until the mark F of theknob 17 is registered with the index 22, whereby the clutch lever 14 isrotated counter-clockwise by the clutch cam 18 to disengage the clutchgear 11 from the take-up gear 9 and the gear 13 integral with the clutchgear 11 is engaged with the counter gears 23 and 25 (FIG. 3). In thisposition, the change-over switch 50 remains closed to maintain thenormal drive circuit so as to allow the photographing operation tocontinue, and the rotation of the shutter shaft 1 causes the rotation ofthe counter gears 23 and 25 instead of the take-up gear 9, so that thepins 24 and 26 of the respective counter gears 23 and 25 move away fromtheir respective associated projections 37c and 29, i.e., in thedirection for increasing the values a, and 0: in FIG. 3. Thus, therotation of the take-up gear 9 is stopped and hence the film transportedin normal direction by the film feeding pawl (FIG. 9) is loosely storedin the film cartridge without being taken up by the take-up shaft 56therein. The length of film thus stored in the film cartridgecorresponds to an angle which is within the possible takeup or rewindrange 0 shown in FIG. 6. When the shutter is released at a desiredangular point a within the possible range 0, the shutter shaft 1 andtherefore the pawled stop discs 3, 4 are stopped at a predeterminedposition by unshown shutter stop member while leaving an available rangeB, and thus the film transportation is also stopped. On the other handthe pin 24 is spaced apart from the projection 370 by an angulardistance corresponding to 0: i.e., a

, When it is desired to release the shutter at the maximum possibletake-up orrewind range, that is to say, when it is desired to take theangle 0: as large as possible within the possible range 0, the shutterrelease operation may be continued until the studded pin 26 of thecounter gear 25 strikes the projections 370 of the stop member 37 as todisplace the projected top end 37b of the stop member 37 toward thepawled stop disc 3 against the action of the U-shaped spring 38. Thus,the shoulder 41 of the pawled stop disc 3 (FIG. 7) in- I terferes withthe top end 37b of the stop member 37,

whereby the rotation of the shutter shaft 1 is automatically stopped andthe film transportation is also stopped. At the same time, the pin 24studded in the counter gear 23 is displaced by the same amount.

Subsequently, light entering through a photographing lens-(not shown) isinterrupted in the known manner, whereafter the operating knob 17 isrotated until mark B thereon is registered with the index 22 as shown inFIG. 4. Thus, the clutch lever 14 is stopped at its counter-clockwiserotated position by the clutch cam 18, and the gear 13 integral with theclutch gear 11 maintains its engagement with the counter gears 23 and25, whereby the change-over switch 50 is changed over to establish areverse drive circuit by the switch cam 19 via switch lever 47. In thisposition, if the shutter button is released, the micromotor 7 will berevolved in reverse direction and accordingly all the parts associatedtherewith will also be driven in reverse direction, whereby the amountof film loosely stored in the take-up chamber in the film cartridge maybe reversely transported to return to the supply chamber. Simultaneouslytherewith, the counter gears 23 and 25 are also rotated in reversedirection so that the pin 24 of the counter gear 23 urges the projection370 of the stop member 37 downwardly to thereby displace the top end 37bof the stop member 37 toward the pawled stop disc 4 against the actionof the U-shaped spring 38. Thus, the shoulder 42 of the pawl member 46in the stop disc 4 interferes with the top end 37b of the stop member37, whereby the reverse rotation of the shutter shaft 1 and accordinglythe reverse movement of the film are stopped automatically.

In FIG. 4, oz represents the angle over which the pin 24 of the countergear 23 is rotated from the time when the top end 37b of the stop member37 is interfered with the shoulder 42 of the stop disc 4 till thereverse rotation is automatically stopped. Such angle of rotation a, canbe approximate to zero by suitably increasing the dimensional ratio ofthe top end 37b to the lower lateral projection 370 of the stop member37.

Subsequently, when the operating knob 17 is again rotated until the markN is registered with the index 22, the switch lever 47 is rotatedcounter-clockwise by the switch cam 19 against the action of the spring49 while the clutch lever 14 is rotated clockwise by the clutch cam 18against the action of the spring 16, to thereby bring the device intothe position ready for effecting normal shot. Thus, the change-overswitch 50 is returned to the normal drive position and the gear 13 isdisengaged from the counter gears 23 and 25, while the clutch gear 11 isengaged with the take-up gear 9. Thus, the counter gears 23 and 25 arereturned to their predetermined positions with the aid of pins 24 and26, U-shaped spring 38, spiral spring 30, and pawls 45 and 46. At thesame time, the stop member 37 is returned by the urge of the U-shapedspring 38 to its normal position where the stop member 37 is notinterfered with by any of the pawls 45 and 46 of the stop discs 3 and 4.If the shutter button is actuated in this state, there will beaccomplished a double shot.

Referring to FIG. 8, relations between the dimensions of the filmchambers and the length of the film therein are graphically shown withthe film roll diametersand the spaces in the supply and take-up chambersin the film magazine overlapping'each other. The upper triangle definedby the leftwardly downward diagonal represents the space in the take-upchamber, and the upper triangle defined by the rightwardly downwarddiagonal represents the space in the supply chamber. The triangle Ashown with hatching designates the film roll diameter in the supplychamber, and the other triangle B shown with hatching represents thefilm roll diameter in the supply chamber. C-C represents the range overwhich the film can be loosely fed and rewound. As seen, such range isgradually increased from the initial stage of photographing and reachesa peak in the middle stage, whereafter it is gradually decreased towardthe termination of photographing. Letter D represents the possible filmtake-up or rewind range according to the prior art.

It will thus be noted that according to the present invention, the factthat the space in each of the supply and take-up chambers of the filmcartridge varies in proportion to the length of film photographed isutilized to the utmost so that the length of film to be loosely fed intothe take-up chamber of the film cartridge can be varied in proportion tothe length of film photographed. Moreover, the length of film to beloosely fed can be selected as desired within a predetermined range, andthe exact length of film thus loosely fed into the take-up chamber canbe rewound into the supply chamber. What is claimed is:

1. In a cinecamera of the type using a film cartridge equipped withanti-reversing means attached to a shaft for taking up the film, andincluding a driving shaft, shutter means operable by said driving shaft;driving means for normally and reversely rotating the driving shaft;

means for transporting the film, associated with said driving shaft; and

means for preventing the rotation of the take-up shaft while said filmtransporting means is operated to loosely feed the film into a take-upchamber in the film cartridge and loosely rewind the loosely fed filminto a supply chamber said cartridge;

the improvement comprising means for automatically stopping the normaland the reverse rotation of the driving shaft;

means for determining the maximum amount of the film which is looselyfed into the take-up chamber and then rewound into said supply chamber;

said determining means being associated with the driving shaft to varysaid maximum amount in accordance with the amount of film wound on thetake-up shaft;

first means for operating the automatic stopping means to stop thenormal rotation of the driving shaft when the film is loosely fed by themaximum amount into the take-up chamber; and

second means for operating said automatic stopping means to stop thereverse rotation of the driving shaft when the film is loosely rewoundinto the supply chamber by the same length as that of the film looselyfed into the take-up chamber.

2. A cinecamera as defined in claim 1, wherein said determining meanscomprises a cam member movable in association with the driving shaft; arack member biassed to contact with the cam member and movable between afirst position and a second position;

said cam member displacing the rack member from the first position tothe second position thereof while the film is wound on the take-up shaftfrom the first extremity to the middle thereof and displacing the rackmember from the second position to the first position while the film iswound on the take-up shaft from the middle to the last extremitythereof; and

a detector gear meshed with the rack member and provided with anintegral gear and a protrusion thereon.

3. A cinecamera as defined in claim 1, wherein said automatic stoppingmeans comprises a pair of discs securely mounted on said driving shaftand a stop member cooperable with said stop discs,

said stop member being movable among a neutral position, a firstposition in which one of said discs is engaged therewith to stop thenormal rotation of said driving shaft and a second position in which theother disc is engaged therewith to stop the reverse rotation of saiddriving shaft, said stop member being biassed to the neutral positionthereof.

4. A cinecamera as defined in claim 3, wherein said first operationmeans comprises a first counter gear rotatably mounted on said integralshaft of the detector gear;

said first counter bear being associated with the driv ing shaft whensaid film transporting means is operated to loosely feed the film intothe take-up chamber and loosely rewind the loosely fed film into thesupply chamber,

and a pin provided on the first counter gear; said first counter gearbeing biassed for said pin to engage said protrusion of the detectorgear and positioned for said pin to engage said stop member which is inthe neutral position thereof when said rack member is in the firstposition thereof,

whereby said pin displaces the stop member from the neutral position tothe first position thereof to thereby stop the normal rotation of thedriving shaft when the film is loosely fed by said maximum amount intothe take-up chamber.

5. A cinecamera as defined in claim 4, wherein said first counter gearfurther includes a prolonged hole, and said second operating meanscomprises a second counter gear rotatably mounted on said integralshaft; said second counter gear being associated with the driving shaftwhen said film transporting means is operated to loosely feed the filminto the take-up chamber and loosely rewind the loosely fed film intothe supply chamber, and a pin provided on the second counter gear; saidsecond counter gear being positioned for the pin thereon to engage saidstop member on the opposite side of said pin of the first counter gearthrough said prolonged hole,

whereby said pin of the second counter gear displaces the stop memberfrom the neutral position to the second position thereof to thereby stopthe reverse rotation of the driving shaft when the film is looselyrewound into the supply chamber by the same amount as that of the filmloosely fed into the take-up chamber. 6. A cinecamera as defined inclaim 1, wherein said determining means comprises a cam member movablein association with the driving shaft; and

a cam follower biassed to contact with the cam member and movablebetween a first position and a second position:

said cam member displacing the cam follower from the first position tothe second position thereof while the film is wound on the take-up shaftfrom um'nar) s'm'ncs m'rzwr OFFICE CERTH LCA'IE 0F CORRECTION Patent No;3,689,137 Dated S ptember 5 1972 Inventofls) YOZO IIDA Page 1 Of '3 Itis certified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below:

On the title page, line 2, change "Yozo" to read Iida-;

at entry 72, change "Iida Yozo" to "read Yozo lida---; Column 1,

line 24 "temporally" should read -temporar ily- Column 2, line 2, delete"including" and insert includes a line 6 delete "and" and insert -is-;

line 7, before "the", insert -and-;

line 8, change "displace" to displacing-;

line 10,. before "manner", inse t -'---a--;

line 14, change "displace" to displacing-;

line 15 change "displace" to --displacing-;

line 20 change "the amount of: the film" to read --the amount of film; Iline 47, change "form" to --from-;

Column 3, line .9 "shutter 6 should read -sector- 6'--;

line 17, "direction" should read directions--.

OHM PC3-1050 (IO-69) um'n-in 5121' 15s PATENT OFFICE CEl'llFlCi-i'lli ObCORRECTION Patent to. 3,689,137 Dated September 5, 1972 YOZO IIDA Page 20f 3 Inventofls) It is certified that error appears in theabove-identified patent and that said Letters Patent are herebycorrected as shown below:

Column 3, line 41, delete "integrally" and insert a-;

line 41, delete "which" and insert ---integral therewith asline 4 43,change "marking" to mar'king ;s I line 44, change "marking" toIriarkings;

' change "cooperates" to --cooperate--;' line 51, delete "to" I line 52,delete "be described";

line 67, delete "side" Column 4 line 1, after "described", insert -be low,

lines ll and 12, the phrase "connecting ooeratiir e should read-connected operativsly line 24 change "displace" .to -displaci ngline1;.0 & 41, "and formed" should read ---are formed;

Column 5, line 21, after "micromotor" delete I v line '32, change"unshown" to read -an i line 33, after "member", insert (not shown')--;

UsCOMM-DC 60376-P89 n u.s. covcnnvzm rammn: OFIICL nu o-uwq):

' 11mm)'s'xua'rx-zs PA'lI'ZN'l OFFICE CERTH ICA'LE OF C ERECTION- Datedtember 5 1972 Patent 210. 3 l 689 137 g 3 of 3 Invent0r(s) YOZO IIDA Itis certified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shmm below:

Column 7, line 60 after "chamber", insert in Column 8, line 49 "bear"should read -gear-;

Column 10, line 8, change 2 to Signed and sealed this 23rd day of JulyI974.

(SEAL) Attest:

MCCOY M. GIBSON, JR. Attesting Officer G. MARSHALL DANN Commissioner ofPatents USCOMM-DC 623764 A 0.5. zovzmuzu "mm-'6 ornz: an o-a FORMPC9-1050 (O-69)

1. In a cinecamera of the type using a film cartridge equipped withanti-reversing means attached to a shaft for taking up the film, andincluding a driving shaft, shutter means operable by said driving shaft;driving means for normally and reversely rotating the driving shaft;means for transporting the film, associated with said driving shaft; andmeans for preventing the rotation of the takE-up shaft while said filmtransporting means is operated to loosely feed the film into a take-upchamber in the film cartridge and loosely rewind the loosely fed filminto a supply chamber said cartridge; the improvement comprising meansfor automatically stopping the normal and the reverse rotation of thedriving shaft; means for determining the maximum amount of the filmwhich is loosely fed into the take-up chamber and then rewound into saidsupply chamber; said determining means being associated with the drivingshaft to vary said maximum amount in accordance with the amount of filmwound on the take-up shaft; first means for operating the automaticstopping means to stop the normal rotation of the driving shaft when thefilm is loosely fed by the maximum amount into the take-up chamber; andsecond means for operating said automatic stopping means to stop thereverse rotation of the driving shaft when the film is loosely rewoundinto the supply chamber by the same length as that of the film looselyfed into the take-up chamber.
 2. A cinecamera as defined in claim 1,wherein said determining means comprises a cam member movable inassociation with the driving shaft; a rack member biassed to contactwith the cam member and movable between a first position and a secondposition; said cam member displacing the rack member from the firstposition to the second position thereof while the film is wound on thetake-up shaft from the first extremity to the middle thereof anddisplacing the rack member from the second position to the firstposition while the film is wound on the take-up shaft from the middle tothe last extremity thereof; and a detector gear meshed with the rackmember and provided with an integral gear and a protrusion thereon.
 3. Acinecamera as defined in claim 1, wherein said automatic stopping meanscomprises a pair of discs securely mounted on said driving shaft and astop member cooperable with said stop discs, said stop member beingmovable among a neutral position, a first position in which one of saiddiscs is engaged therewith to stop the normal rotation of said drivingshaft and a second position in which the other disc is engaged therewithto stop the reverse rotation of said driving shaft, said stop memberbeing biassed to the neutral position thereof.
 4. A cinecamera asdefined in claim 3, wherein said first operation means comprises a firstcounter gear rotatably mounted on said integral shaft of the detectorgear; said first counter bear being associated with the driving shaftwhen said film transporting means is operated to loosely feed the filminto the take-up chamber and loosely rewind the loosely fed film intothe supply chamber, and a pin provided on the first counter gear; saidfirst counter gear being biassed for said pin to engage said protrusionof the detector gear and positioned for said pin to engage said stopmember which is in the neutral position thereof when said rack member isin the first position thereof, whereby said pin displaces the stopmember from the neutral position to the first position thereof tothereby stop the normal rotation of the driving shaft when the film isloosely fed by said maximum amount into the take-up chamber.
 5. Acinecamera as defined in claim 4, wherein said first counter gearfurther includes a prolonged hole, and said second operating meanscomprises a second counter gear rotatably mounted on said integralshaft; said second counter gear being associated with the driving shaftwhen said film transporting means is operated to loosely feed the filminto the take-up chamber and loosely rewind the loosely fed film intothe supply chamber, and a pin provided on the second counter gear; saidsecond counter gear being positioned for the pin thereon to engage saidstop member on the opposite side of said pin of the first counter gearthrough said prolonged hole, whereby said pin of the second counter geardisplaCes the stop member from the neutral position to the secondposition thereof to thereby stop the reverse rotation of the drivingshaft when the film is loosely rewound into the supply chamber by thesame amount as that of the film loosely fed into the take-up chamber. 6.A cinecamera as defined in claim 1, wherein said determining meanscomprises a cam member movable in association with the driving shaft;and a cam follower biassed to contact with the cam member and movablebetween a first position and a second position: said cam memberdisplacing the cam follower from the first position to the secondposition thereof while the film is wound on the take-up shaft from thefirst extremity to the middle thereof and from the second position tothe first position while the film is wound from the middle to the lastextremity thereof.